The United Baltic Duchy (Latvian: Apvienotā Baltijas Lielhercogisti, Estonian: Ühendatud Balti Hertsogiriik), commonly known as Livonia (Estonian: Liivimaa, Latvian: Livonia), is a state in the Baltic region of Northern Europe. It is bordered to the north by the Gulf of Finland, to the west by the Baltic Sea, to the south by Lithuania, and to the east by Russia. Across the Baltic Sea lies Sweden in the west and Finland in the north. The territory of Livonia covers 109,817 km2 and is influenced by a temperate seasonal climate.

Livonia is a democratic constitutional monarchy and is divided into 7 counties. The capital is Valmiera, and the largest city is Riga. Livonia is listed as a High-Income Economy by the World Bank and a High-Income OECD member. The United Nations lists Livonia as a developed country with a Human Development Index of "Very High". The country is also ranked highly for press freedom, economic freedom, democracy, and political freedom and education.